Claude
The Artmaster cachet features green ink illustrations of classical architectural column capitals and decorative elements, with the text 'Honoring American Architecture' and 'First Day of Issue' in script. The 15-cent stamp depicts the Renwick/Smithsonian Institution Building in Washington, rendered in a detailed engraved style in gray/black tones. The machine cancel from New York, NY dated October 9, 1980 includes horizontal bars and the text 'First Day of Issue.' The cover is unaddressed and in excellent condition.
Mistral
This First Day Cover features a detailed cachet artwork by Artmaster, showcasing classical architectural elements such as column capitals and decorative motifs in green ink. The stamp depicts the Renwick Gallery/Smithsonian Institution Building in Washington, D.C., with the text 'Architecture USA 15c' and 'Renwick 1880–1980 Smithsonian Washington'. The postmark is a circular machine cancellation dated October 9, 1980, from New York, NY. The cover is in excellent condition, with clear and legible text and artwork.
(The automatic summaries sometimes misidentify the postmark as part of the cachet artwork.)
